gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2013 Free Software Foundation, Inc.
   3    Contributed by Dmitry Vyukov <dvyukov@google.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tree.h"
  26 #include "expr.h"
  27 #include "intl.h"
  28 #include "tm.h"
  29 #include "basic-block.h"
  30 #include "gimple.h"
  31 #include "gimplify.h"
  32 #include "gimple-iterator.h"
  33 #include "function.h"
  34 #include "gimple-ssa.h"
  35 #include "cgraph.h"
  36 #include "tree-cfg.h"
  37 #include "stringpool.h"
  38 #include "tree-ssanames.h"
  39 #include "tree-pass.h"
  40 #include "tree-iterator.h"
  41 #include "langhooks.h"
  42 #include "output.h"
  43 #include "options.h"
  44 #include "target.h"
  45 #include "diagnostic.h"
  46 #include "tree-ssa-propagate.h"
  47 #include "tsan.h"
  48 #include "asan.h"
  49
  50 /* Number of instrumented memory accesses in the current function.  */
  51
  52 /* Builds the following decl
  53    void __tsan_read/writeX (void *addr);  */
  54
  55 static tree
  56 get_memory_access_decl (bool is_write, unsigned size)
  57 {
  58   enum built_in_function fcode;
  59
  60   if (size <= 1)
  61     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  62                      : BUILT_IN_TSAN_READ1;
  63   else if (size <= 3)
  64     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  65                      : BUILT_IN_TSAN_READ2;
  66   else if (size <= 7)
  67     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  68                      : BUILT_IN_TSAN_READ4;
  69   else if (size <= 15)
  70     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  71                      : BUILT_IN_TSAN_READ8;
  72   else
  73     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  74                      : BUILT_IN_TSAN_READ16;
  75
  76   return builtin_decl_implicit (fcode);
  77 }
  78
  79 /* Check as to whether EXPR refers to a store to vptr.  */
  80
  81 static tree
  82 is_vptr_store (gimple stmt, tree expr, bool is_write)
  83 {
  84   if (is_write == true
  85       && gimple_assign_single_p (stmt)
  86       && TREE_CODE (expr) == COMPONENT_REF)
  87     {
  88       tree field = TREE_OPERAND (expr, 1);
  89       if (TREE_CODE (field) == FIELD_DECL
  90           && DECL_VIRTUAL_P (field))
  91         return gimple_assign_rhs1 (stmt);
  92     }
  93   return NULL;
  94 }
  95
  96 /* Instruments EXPR if needed. If any instrumentation is inserted,
  97    return true.  */
  98
  99 static bool
 100 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 101 {
 102   tree base, rhs, expr_ptr, builtin_decl;
 103   basic_block bb;
 104   HOST_WIDE_INT size;
 105   gimple stmt, g;
 106   gimple_seq seq;
 107   location_t loc;
 108
 109   size = int_size_in_bytes (TREE_TYPE (expr));
 110   if (size == -1)
 111     return false;
 112
 113   /* For now just avoid instrumenting bit field acceses.
 114      TODO: handle bit-fields as if touching the whole field.  */
 115   HOST_WIDE_INT bitsize, bitpos;
 116   tree offset;
 117   enum machine_mode mode;
 118   int volatilep = 0, unsignedp = 0;
 119   base = get_inner_reference (expr, &bitsize, &bitpos, &offset,
 120                               &mode, &unsignedp, &volatilep, false);
 121
 122   /* No need to instrument accesses to decls that don't escape,
 123      they can't escape to other threads then.  */
 124   if (DECL_P (base))
 125     {
 126       struct pt_solution pt;
 127       memset (&pt, 0, sizeof (pt));
 128       pt.escaped = 1;
 129       pt.ipa_escaped = flag_ipa_pta != 0;
 130       pt.nonlocal = 1;
 131       if (!pt_solution_includes (&pt, base))
 132         return false;
 133       if (!is_global_var (base) && !may_be_aliased (base))
 134         return false;
 135     }
 136
 137   if (TREE_READONLY (base)
 138       || (TREE_CODE (base) == VAR_DECL
 139           && DECL_HARD_REGISTER (base)))
 140     return false;
 141
 142   if (size == 0
 143       || bitpos % (size * BITS_PER_UNIT)
 144       || bitsize != size * BITS_PER_UNIT)
 145     return false;
 146
 147   stmt = gsi_stmt (gsi);
 148   loc = gimple_location (stmt);
 149   rhs = is_vptr_store (stmt, expr, is_write);
 150   gcc_checking_assert (rhs != NULL || is_gimple_addressable (expr));
 151   expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 152   seq = NULL;
 153   if (!is_gimple_val (expr_ptr))
 154     {
 155       g = gimple_build_assign (make_ssa_name (TREE_TYPE (expr_ptr), NULL),
 156                                expr_ptr);
 157       expr_ptr = gimple_assign_lhs (g);
 158       gimple_set_location (g, loc);
 159       gimple_seq_add_stmt_without_update (&seq, g);
 160     }
 161   if (rhs == NULL)
 162     g = gimple_build_call (get_memory_access_decl (is_write, size),
 163                            1, expr_ptr);
 164   else
 165     {
 166       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 167       g = gimple_build_call (builtin_decl, 1, expr_ptr);
 168     }
 169   gimple_set_location (g, loc);
 170   gimple_seq_add_stmt_without_update (&seq, g);
 171   /* Instrumentation for assignment of a function result
 172      must be inserted after the call.  Instrumentation for
 173      reads of function arguments must be inserted before the call.
 174      That's because the call can contain synchronization.  */
 175   if (is_gimple_call (stmt) && is_write)
 176     {
 177       /* If the call can throw, it must be the last stmt in
 178          a basic block, so the instrumented stmts need to be
 179          inserted in successor bbs.  */
 180       if (is_ctrl_altering_stmt (stmt))
 181         {
 182           edge e;
 183
 184           bb = gsi_bb (gsi);
 185           e = find_fallthru_edge (bb->succs);
 186           if (e)
 187             gsi_insert_seq_on_edge_immediate (e, seq);
 188         }
 189       else
 190         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 191     }
 192   else
 193     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 194
 195   return true;
 196 }
 197
 198 /* Actions for sync/atomic builtin transformations.  */
 199 enum tsan_atomic_action
 200 {
 201   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 202   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 203 };
 204
 205 /* Table how to map sync/atomic builtins to their corresponding
 206    tsan equivalents.  */
 207 static const struct tsan_map_atomic
 208 {
 209   enum built_in_function fcode, tsan_fcode;
 210   enum tsan_atomic_action action;
 211   enum tree_code code;
 212 } tsan_atomic_table[] =
 213 {
 214 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 215   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 216 #define CHECK_LAST(fcode, tsan_fcode) \
 217   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 218 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 219   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 220 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 221   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 222 #define WEAK_CAS(fcode, tsan_fcode) \
 223   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 224 #define STRONG_CAS(fcode, tsan_fcode) \
 225   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 226 #define BOOL_CAS(fcode, tsan_fcode) \
 227   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 228 #define VAL_CAS(fcode, tsan_fcode) \
 229   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 230 #define LOCK_RELEASE(fcode, tsan_fcode) \
 231   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 232 #define FETCH_OP(fcode, tsan_fcode, code) \
 233   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 234 #define FETCH_OPS(fcode, tsan_fcode, code) \
 235   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 236
 237   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 238   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 239   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 240   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 241   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 242   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 243   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 244   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 245   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 246   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 247   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 248   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 249   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 250   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 251   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 252   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 253   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 254   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 255   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 256   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 257   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 258   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 259   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 260   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 261   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 262   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 263   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 264   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 265   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 266   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 267   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 268   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 269   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 270   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 271   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 272   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 273   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 274   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 275   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 276   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 277   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 278   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 279   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 280   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 281   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 282
 283   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 284   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 285
 286   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 287   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 288   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 289   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 290   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 291   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 292   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 293   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 294   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 295   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 296   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 297   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 298   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 299   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 300   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 301   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 302   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 303   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 304   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 305   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 306   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 307   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 308   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 309   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 310   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 311   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 312   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 313   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 314   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 315   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 316
 317   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 318   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 319   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 320   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 321   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 322
 323   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 324   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 325   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 326   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 327   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 328   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 329   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 330   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 331   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 332   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 333   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 334   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 335   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 336   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 337   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 338   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 339   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 340   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 341   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 342   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 343   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 344   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 345   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 346   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 347   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 348   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 349   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 350   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 351   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 352   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 353
 354   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 355
 356   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 357   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 358   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 359   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 360   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 361   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 362   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 363   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 364   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 365   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 366   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 367   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 368   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 369   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 370   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 371   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 372   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 373   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 374   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 375   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 376   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 377   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 378   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 379   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 380   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 381   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 382   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 383   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 384   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 385   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 386
 387   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 388   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 389   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 390   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 391   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 392
 393   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 394   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 395               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 396   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 397               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 398   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 399               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 400   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 401               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 402
 403   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 404             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 405   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 406             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 407   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 408             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 409   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 410             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 411   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 412             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 413
 414   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 415   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 416   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 417   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 418   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 419            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 420
 421   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 422   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 423   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 424   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 425   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE)
 426 };
 427
 428 /* Instrument an atomic builtin.  */
 429
 430 static void
 431 instrument_builtin_call (gimple_stmt_iterator *gsi)
 432 {
 433   gimple stmt = gsi_stmt (*gsi), g;
 434   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 435   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 436   unsigned int i, num = gimple_call_num_args (stmt), j;
 437   for (j = 0; j < 6 && j < num; j++)
 438     args[j] = gimple_call_arg (stmt, j);
 439   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 440     if (fcode != tsan_atomic_table[i].fcode)
 441       continue;
 442     else
 443       {
 444         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 445         if (decl == NULL_TREE)
 446           return;
 447         switch (tsan_atomic_table[i].action)
 448           {
 449           case check_last:
 450           case fetch_op:
 451             last_arg = gimple_call_arg (stmt, num - 1);
 452             if (!tree_fits_uhwi_p (last_arg)
 453                 || tree_to_uhwi (last_arg) > MEMMODEL_SEQ_CST)
 454               return;
 455             gimple_call_set_fndecl (stmt, decl);
 456             update_stmt (stmt);
 457             if (tsan_atomic_table[i].action == fetch_op)
 458               {
 459                 args[1] = gimple_call_arg (stmt, 1);
 460                 goto adjust_result;
 461               }
 462             return;
 463           case add_seq_cst:
 464           case add_acquire:
 465           case fetch_op_seq_cst:
 466             gcc_assert (num <= 2);
 467             for (j = 0; j < num; j++)
 468               args[j] = gimple_call_arg (stmt, j);
 469             for (; j < 2; j++)
 470               args[j] = NULL_TREE;
 471             args[num] = build_int_cst (NULL_TREE,
 472                                        tsan_atomic_table[i].action
 473                                        != add_acquire
 474                                        ? MEMMODEL_SEQ_CST
 475                                        : MEMMODEL_ACQUIRE);
 476             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 477             stmt = gsi_stmt (*gsi);
 478             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 479               {
 480               adjust_result:
 481                 lhs = gimple_call_lhs (stmt);
 482                 if (lhs == NULL_TREE)
 483                   return;
 484                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 485                                                 TREE_TYPE (args[1])))
 486                   {
 487                     tree var = make_ssa_name (TREE_TYPE (lhs), NULL);
 488                     g = gimple_build_assign_with_ops (NOP_EXPR, var,
 489                                                       args[1], NULL_TREE);
 490                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 491                     args[1] = var;
 492                   }
 493                 gimple_call_set_lhs (stmt,
 494                                      make_ssa_name (TREE_TYPE (lhs), NULL));
 495                 /* BIT_NOT_EXPR stands for NAND.  */
 496                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 497                   {
 498                     tree var = make_ssa_name (TREE_TYPE (lhs), NULL);
 499                     g = gimple_build_assign_with_ops (BIT_AND_EXPR, var,
 500                                                       gimple_call_lhs (stmt),
 501                                                       args[1]);
 502                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 503                     g = gimple_build_assign_with_ops (BIT_NOT_EXPR, lhs, var,
 504                                                       NULL_TREE);
 505                   }
 506                 else
 507                   g = gimple_build_assign_with_ops (tsan_atomic_table[i].code,
 508                                                     lhs,
 509                                                     gimple_call_lhs (stmt),
 510                                                     args[1]);
 511                 update_stmt (stmt);
 512                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 513               }
 514             return;
 515           case weak_cas:
 516             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 517               continue;
 518             /* FALLTHRU */
 519           case strong_cas:
 520             gcc_assert (num == 6);
 521             for (j = 0; j < 6; j++)
 522               args[j] = gimple_call_arg (stmt, j);
 523             if (!tree_fits_uhwi_p (args[4])
 524                 || tree_to_uhwi (args[4]) > MEMMODEL_SEQ_CST)
 525               return;
 526             if (!tree_fits_uhwi_p (args[5])
 527                 || tree_to_uhwi (args[5]) > MEMMODEL_SEQ_CST)
 528               return;
 529             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 530                                 args[4], args[5]);
 531             return;
 532           case bool_cas:
 533           case val_cas:
 534             gcc_assert (num == 3);
 535             for (j = 0; j < 3; j++)
 536               args[j] = gimple_call_arg (stmt, j);
 537             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 538             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 539             t = create_tmp_var (t, NULL);
 540             mark_addressable (t);
 541             if (!useless_type_conversion_p (TREE_TYPE (t),
 542                                             TREE_TYPE (args[1])))
 543               {
 544                 g = gimple_build_assign_with_ops (NOP_EXPR,
 545                                                   make_ssa_name (TREE_TYPE (t),
 546                                                                  NULL),
 547                                                   args[1], NULL_TREE);
 548                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 549                 args[1] = gimple_assign_lhs (g);
 550               }
 551             g = gimple_build_assign (t, args[1]);
 552             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 553             lhs = gimple_call_lhs (stmt);
 554             update_gimple_call (gsi, decl, 5, args[0],
 555                                 build_fold_addr_expr (t), args[2],
 556                                 build_int_cst (NULL_TREE,
 557                                                MEMMODEL_SEQ_CST),
 558                                 build_int_cst (NULL_TREE,
 559                                                MEMMODEL_SEQ_CST));
 560             if (tsan_atomic_table[i].action == val_cas && lhs)
 561               {
 562                 tree cond;
 563                 stmt = gsi_stmt (*gsi);
 564                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t), NULL),
 565                                          t);
 566                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 567                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 568                 cond = build2 (NE_EXPR, boolean_type_node, t,
 569                                build_int_cst (TREE_TYPE (t), 0));
 570                 g = gimple_build_assign_with_ops (COND_EXPR, lhs, cond,
 571                                                   args[1],
 572                                                   gimple_assign_lhs (g));
 573                 gimple_call_set_lhs (stmt, t);
 574                 update_stmt (stmt);
 575                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 576               }
 577             return;
 578           case lock_release:
 579             gcc_assert (num == 1);
 580             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 581             t = TREE_VALUE (TREE_CHAIN (t));
 582             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 583                                 build_int_cst (t, 0),
 584                                 build_int_cst (NULL_TREE,
 585                                                MEMMODEL_RELEASE));
 586             return;
 587           default:
 588             continue;
 589           }
 590       }
 591 }
 592
 593 /* Instruments the gimple pointed to by GSI. Return
 594    true if func entry/exit should be instrumented.  */
 595
 596 static bool
 597 instrument_gimple (gimple_stmt_iterator *gsi)
 598 {
 599   gimple stmt;
 600   tree rhs, lhs;
 601   bool instrumented = false;
 602
 603   stmt = gsi_stmt (*gsi);
 604   if (is_gimple_call (stmt)
 605       && (gimple_call_fndecl (stmt)
 606           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 607     {
 608       if (is_gimple_builtin_call (stmt))
 609         instrument_builtin_call (gsi);
 610       return true;
 611     }
 612   else if (is_gimple_assign (stmt)
 613            && !gimple_clobber_p (stmt))
 614     {
 615       if (gimple_store_p (stmt))
 616         {
 617           lhs = gimple_assign_lhs (stmt);
 618           instrumented = instrument_expr (*gsi, lhs, true);
 619         }
 620       if (gimple_assign_load_p (stmt))
 621         {
 622           rhs = gimple_assign_rhs1 (stmt);
 623           instrumented = instrument_expr (*gsi, rhs, false);
 624         }
 625     }
 626   return instrumented;
 627 }
 628
 629 /* Instruments all interesting memory accesses in the current function.
 630    Return true if func entry/exit should be instrumented.  */
 631
 632 static bool
 633 instrument_memory_accesses (void)
 634 {
 635   basic_block bb;
 636   gimple_stmt_iterator gsi;
 637   bool fentry_exit_instrument = false;
 638
 639   FOR_EACH_BB (bb)
 640     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 641       fentry_exit_instrument |= instrument_gimple (&gsi);
 642   return fentry_exit_instrument;
 643 }
 644
 645 /* Instruments function entry.  */
 646
 647 static void
 648 instrument_func_entry (void)
 649 {
 650   basic_block succ_bb;
 651   gimple_stmt_iterator gsi;
 652   tree ret_addr, builtin_decl;
 653   gimple g;
 654
 655   succ_bb = single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 656   gsi = gsi_after_labels (succ_bb);
 657
 658   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 659   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 660   ret_addr = make_ssa_name (ptr_type_node, NULL);
 661   gimple_call_set_lhs (g, ret_addr);
 662   gimple_set_location (g, cfun->function_start_locus);
 663   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 664
 665   builtin_decl =  builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 666   g = gimple_build_call (builtin_decl, 1, ret_addr);
 667   gimple_set_location (g, cfun->function_start_locus);
 668   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 669 }
 670
 671 /* Instruments function exits.  */
 672
 673 static void
 674 instrument_func_exit (void)
 675 {
 676   location_t loc;
 677   basic_block exit_bb;
 678   gimple_stmt_iterator gsi;
 679   gimple stmt, g;
 680   tree builtin_decl;
 681   edge e;
 682   edge_iterator ei;
 683
 684   /* Find all function exits.  */
 685   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 686   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 687     {
 688       gsi = gsi_last_bb (e->src);
 689       stmt = gsi_stmt (gsi);
 690       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 691                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 692       loc = gimple_location (stmt);
 693       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 694       g = gimple_build_call (builtin_decl, 0);
 695       gimple_set_location (g, loc);
 696       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 697     }
 698 }
 699
 700 /* ThreadSanitizer instrumentation pass.  */
 701
 702 static unsigned
 703 tsan_pass (void)
 704 {
 705   initialize_sanitizer_builtins ();
 706   if (instrument_memory_accesses ())
 707     {
 708       instrument_func_entry ();
 709       instrument_func_exit ();
 710     }
 711   return 0;
 712 }
 713
 714 /* The pass's gate.  */
 715
 716 static bool
 717 tsan_gate (void)
 718 {
 719   return (flag_sanitize & SANITIZE_THREAD) != 0;
 720 }
 721
 722 /* Inserts __tsan_init () into the list of CTORs.  */
 723
 724 void
 725 tsan_finish_file (void)
 726 {
 727   tree ctor_statements = NULL_TREE;
 728
 729   initialize_sanitizer_builtins ();
 730   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 731   append_to_statement_list (build_call_expr (init_decl, 0),
 732                             &ctor_statements);
 733   cgraph_build_static_cdtor ('I', ctor_statements,
 734                              MAX_RESERVED_INIT_PRIORITY - 1);
 735 }
 736
 737 /* The pass descriptor.  */
 738
 739 namespace {
 740
 741 const pass_data pass_data_tsan =
 742 {
 743   GIMPLE_PASS, /* type */
 744   "tsan", /* name */
 745   OPTGROUP_NONE, /* optinfo_flags */
 746   true, /* has_gate */
 747   true, /* has_execute */
 748   TV_NONE, /* tv_id */
 749   ( PROP_ssa | PROP_cfg ), /* properties_required */
 750   0, /* properties_provided */
 751   0, /* properties_destroyed */
 752   0, /* todo_flags_start */
 753   ( TODO_verify_all | TODO_update_ssa ), /* todo_flags_finish */
 754 };
 755
 756 class pass_tsan : public gimple_opt_pass
 757 {
 758 public:
 759   pass_tsan (gcc::context *ctxt)
 760     : gimple_opt_pass (pass_data_tsan, ctxt)
 761   {}
 762
 763   /* opt_pass methods: */
 764   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 765   bool gate () { return tsan_gate (); }
 766   unsigned int execute () { return tsan_pass (); }
 767
 768 }; // class pass_tsan
 769
 770 } // anon namespace
 771
 772 gimple_opt_pass *
 773 make_pass_tsan (gcc::context *ctxt)
 774 {
 775   return new pass_tsan (ctxt);
 776 }
 777
 778 static bool
 779 tsan_gate_O0 (void)
 780 {
 781   return (flag_sanitize & SANITIZE_THREAD) != 0 && !optimize;
 782 }
 783
 784 namespace {
 785
 786 const pass_data pass_data_tsan_O0 =
 787 {
 788   GIMPLE_PASS, /* type */
 789   "tsan0", /* name */
 790   OPTGROUP_NONE, /* optinfo_flags */
 791   true, /* has_gate */
 792   true, /* has_execute */
 793   TV_NONE, /* tv_id */
 794   ( PROP_ssa | PROP_cfg ), /* properties_required */
 795   0, /* properties_provided */
 796   0, /* properties_destroyed */
 797   0, /* todo_flags_start */
 798   ( TODO_verify_all | TODO_update_ssa ), /* todo_flags_finish */
 799 };
 800
 801 class pass_tsan_O0 : public gimple_opt_pass
 802 {
 803 public:
 804   pass_tsan_O0 (gcc::context *ctxt)
 805     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 806   {}
 807
 808   /* opt_pass methods: */
 809   bool gate () { return tsan_gate_O0 (); }
 810   unsigned int execute () { return tsan_pass (); }
 811
 812 }; // class pass_tsan_O0
 813
 814 } // anon namespace
 815
 816 gimple_opt_pass *
 817 make_pass_tsan_O0 (gcc::context *ctxt)
 818 {
 819   return new pass_tsan_O0 (ctxt);
 820 }